分布式SAR相位同步误差的影响分析与试验验证  

Influence of Distributed SAR Phase Synchronization Error on InSAR Performance and Experiment Validation

作　　者：何志华[1] 何峰[1] 黄海风[1] 梁甸农[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073

出　　处：《宇航学报》2012年第3期353-357,共5页Journal of Astronautics

基　　金：国家自然科学基金(61101187)

摘　　要：相位同步是分布式SAR系统必须考虑的突出问题之一。建立了双向脉冲交换相位同步全数字仿真模型,仿真得到相位同步误差信号。基于全数字仿真系统分析了不同类型相位同步误差对InSAR测高性能的影响。最后利用地面半实物仿真试验得到实际分布式SAR系统相位同步误差及其对InSAR测高的影响,实测相位同步误差标准差为2.6度,引起的InSAR相对测高精度损失在厘米量级;并且半实物试验结果与全数字试验结果一致,表明了相位同步方案及其影响分析的正确性。本文工作对分布式SAR相位同步分系统的设计与实现具有重要指导意义。Phase synchronization is a key problem that has to be considered in the distributed SAR.A simulation model for the pulsed alternate synchronization scheme is established to obtain the phase synchronization error signal.Based on the computer-based simulation system,the influence of different synchronization error characteristics on the InSAR height measurement performance is analyzed.The ground-based hardware-in-the-loop simulation is carried out to investigate the influence of actual synchronization error on InSAR performance.The standard deviation of the phase synchronization error is 2.6 degree and its influence on the InSAR relative height measurement is on the centimeter magnitude.The hardware-in-the-loop simulation results are found to be consistent with the computer-based simulation results,which validates the phase synchronization scheme and the influence analysis results.The work of this paper offers powerful support for the design and realization of the phase synchronization subsystem.

关 键 词：分布式SAR 相位同步误差 双向脉冲交换 全数字仿真 半实物仿真 

分 类 号：TN957[电子电信—信号与信息处理]